We have a single wheel Jugs machine and an old 2 wheel Curve Master machine. We had been using older practice balls and couldn't get control of the break on the curve machine, and both machines would tear up buckets of practice balls. These dimple balls stay consistent off the machine, and the players are more comfortable in the box. The ball sounds right off the bat, I just don't let them use composite bats and prefer they use practice bats. Haven't used them long enough to know how they affect bats. Will order another 2 dozen.